Full-scale validation of PCM-window energy model using the coupled thermo-optical approach

Abstract

The aim of the presented study is an empirical validation of a novel energy model based on the Moving Mushy Volume approach using results of real-scale, long-term experiments. The model is based on the Control Volume and Net Radiation methods with the main objective set as the ability to simulate changing optical and physical properties of PCM in long-term simulations which is novel compared to already existing models. In order to do so the PCM domain was divided into sub-volumes in which the physical state could be analysed separately. The experiments were conducted under temper climatic conditions using a PCM window installed on a façade of the experimental room. The validation days were chosen so that a full solid-to-liquid transition occurred on one day, and the material was fully solidified during the following night. Selected sunny days were characterised by clear and overcast sky conditions. The results reveal a good agreement between the experiment and simulation, although the authors assumed a 1D heat transfer model in the PCM layer.